Searching for redshift ~7 quasars in UKIDSS

Event Date: 

Wednesday, April 10, 2013 - 4:00pm

Event Location: 

  • Broida 3302

Astrophysics Seminar


Daniel Mortlock (Imperial College London)

Quasars are powerful probes of the early Universe, although until recently it has not been practical to search for quasars beyond a redshift of z > 6.5 because they have been identified primarily in optical surveys. Using data from the UKIRT Infrared Deep Sky Survey (UKIDSS), it has been possible to search beyond this optical limit. I will describe the latest results for this survey, focusing on the search methodology and the implications for cosmological reionization out to a redshift of ~7.